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RE: [EnergyPlus_Support] material conductivity troubleI

Problem solved. Thanks a lot Dr. Li. I hope I can help you further. 

To: energyplus_support@xxxxxxxxxxxxxxx
From: yli006@xxxxxxxxxxx
Date: Sun, 4 Nov 2012 16:42:34 -0500
Subject: RE: [EnergyPlus_Support] material conductivity troubleI


I cut your Westery wall into to two and used the two material for each section. 
PAREDE OESTE  N:Surface Inside Face Temperature [C](TimeStep) PAREDE OESTE S:Surface Inside Face Temperature [C](TimeStep)  (Celula )

 If you look at these to columns, the one with lower conductiviity has lower temperature in Summer and higher temper in Winter for the interior surface.  I think, this is what you have expected.
Remember that, over insulation turns the building into a hot house at night in Summer.
Over insulate the floor removes the ground heating or cooling.
When yu have a zone with so many different walls and windows, even the zone data at timestep will not provide you with the characteristic of the material used.
Hope this will help. 
Dr. Li  


To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: rbmeller@xxxxxxxxxxx
Date: Sat, 3 Nov 2012 11:28:54 +0000
Subject: [EnergyPlus_Support] material conductivity troubleI

Hi guys... first of all, sorry about my english 'cause I´m brazilian...
I'm having trouble about simulating with other material. I ran the simulation with a material wich the property goes below:
Name: concreto
thickness: 0.1m
conductivity: 1.75 W/mK
Density: 2300 kg/m³
specific heat: 1000 J/kg.K

The other material is:
name: Concreto celular
conductivity: 0.35 W/mK
Density: 500 kg/m³
Specific heat: 1250 J/kg.K

When I run with concreto celular, the district cooling is higher than concreto. And also the surface inside temperature is higher than concreto. Isn't it strange? The conductivity is lower, but all of the variables shows higher temperature or cooling power higher...

Ps: The concreto celular's absorptance is lower than concreto.

Can anyone help me out?


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